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Why A Kilogram Isn't Actually 1,000 Grams

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 Chemistry   |   Physics   |   Science
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We usually think of weight in terms of pounds and kilograms. But how do we decide how much a kilogram actually weighs?

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Kilogram conflict resolved at last
"For decades, meteorologists have strived to retire 'Le Grand K' - the platinum and iridium cylinder that for 126 years has defined the kilogram from a high-security vault outside Paris. Now it looks as if they at last have the data needed to replace the cylinder with a definition based on mathematical constants."

This Kilogram Has A Weight-Loss Problem
"More than a century ago, a small metal cylinder was forged in London and sent to a leafy suburb of Paris. The cylinder was about the size of a salt shaker and made of an alloy of platinum and iridium, an advanced material at the time."

Elusive Quest for One True Kilogram Finally Pays Off
"For over a century, a golf-ball sized cylinder locked in a vault in Sèvres, France, has defined the true mass of a kilogram (2.2 pounds) for the entire planet. The International Prototype of the Kilogram, a gleaming object of platinum and iridium otherwise known as Le Grand K or Big K, is the last of its kind."

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